Add initial AIO/LIO kernel thread support files. This is preliminary, and
further features will be added.
This commit is contained in:
John Dyson
parent
91487cf4bf
commit
ee877a356c
168
sys/kern/kern_threads.c
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168
sys/kern/kern_threads.c
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@ -0,0 +1,168 @@
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/*
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*
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* Portions of this code was derived from the file kern_fork.c and as such
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* is subject to the copyrights below.
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*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (c) 1996 Douglas Santry
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*
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* This code is subject to the beer copyright. If I chance to meet you in a
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* bar and this code helped you in some way, you owe me a beer. Only
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* in Germany will I accept domestic beer. This code may or may not work
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* and I certainly make no claims as to its fitness for *any* purpose.
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*
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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/acct.h>
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#include <sys/ktrace.h>
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#include <sys/sysproto.h>
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#include <sys/unistd.h>
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#include <vm/vm.h>
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#include <machine/cpu.h>
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/*
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* Low level support for sleep/wakeup paradigm
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* If a timeout is specified:
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* returns 0 if wakeup
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* returns EAGAIN if timed out
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* returns EINVAL if error
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*
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* If a timeout is not specified:
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*
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* returns time waiting in ticks.
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*/
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int
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thr_sleep(struct proc *p, struct thr_sleep_args *uap, int *retval) {
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int sleepStart;
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long long sleeptime;
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int sleepclocks;
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struct timespec ts;
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int error;
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sleepclocks = 0;
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if (uap->timeout != 0) {
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/*
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* Get timespec struct
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*/
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if (error = copyin((caddr_t) uap->timeout, (caddr_t) &ts, sizeof ts)) {
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p->p_wakeup = 0;
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return error;
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}
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sleeptime = (long long) (hz * ts.tv_nsec);
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sleeptime /= 1000000000LL;
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sleeptime += ts.tv_sec * hz;
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sleepclocks = sleeptime;
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if (sleepclocks != sleeptime) {
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p->p_wakeup = 0;
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retval[0] = EINVAL;
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return 0;
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}
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if (sleepclocks == 0)
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sleepclocks = 1;
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}
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retval[0] = 0;
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if (p->p_wakeup == 0) {
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sleepStart = ticks;
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p->p_flag |= P_SINTR;
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error = tsleep(p, PUSER, "thrslp", sleepclocks);
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p->p_flag &= ~P_SINTR;
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if (error == EWOULDBLOCK) {
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p->p_wakeup = 0;
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retval[0] = EAGAIN;
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return 0;
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}
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if (uap->timeout == 0)
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retval[0] = ticks - sleepStart;
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}
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p->p_wakeup = 0;
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return (0);
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}
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int
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thr_wakeup(struct proc *p, struct thr_wakeup_args *uap, int *retval) {
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struct proc *pSlave = p->p_leader;
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while(pSlave && (pSlave->p_pid != uap->pid))
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pSlave = pSlave->p_peers;
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if(pSlave == 0) {
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retval[0] = ESRCH;
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return(0);
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}
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pSlave->p_wakeup++;
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if((pSlave->p_stat == SSLEEP) && (pSlave->p_wchan == pSlave)) {
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wakeup(pSlave);
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return(0);
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}
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retval[0] = EAGAIN;
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return 0;
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}
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/*
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* General purpose yield system call
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*/
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int
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yield(struct proc *p, struct yield_args *uap, int *retval) {
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int s;
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retval[0] = 0;
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s = splhigh();
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p->p_priority = MAXPRI;
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setrunqueue(p);
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mi_switch();
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splx(s);
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return(0);
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}
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264
sys/kern/vfs_aio.c
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264
sys/kern/vfs_aio.c
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@ -0,0 +1,264 @@
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/*
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* Copyright (c) 1997 John S. Dyson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. John S. Dyson's name may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* DISCLAIMER: This code isn't warranted to do anything useful. Anything
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* bad that happens because of using this software isn't the responsibility
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* of the author. This software is distributed AS-IS.
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*
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* $Id$
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*/
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/*
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* This file contains support for the POSIX.4 AIO facility.
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*
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* The initial version provides only the (bogus) synchronous semantics
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* but will support async in the future. Note that a bit
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* in a private field allows the user mode subroutine to adapt
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* the kernel operations to true POSIX.4 for future compatibility.
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*
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* This code is used to support true POSIX.4 AIO/LIO with the help
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* of a user mode subroutine package. Note that eventually more support
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* will be pushed into the kernel.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/namei.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/dirent.h>
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#include <sys/signalvar.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <sys/sysctl.h>
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#include <sys/aio.h>
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/*
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* aio_cancel at the kernel level is a NOOP right now. It
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* might be possible to support it partially in user mode, or
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* in kernel mode later on.
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*/
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int
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aio_cancel(struct proc *p, struct aio_cancel_args *uap, int *retval) {
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return AIO_NOTCANCELLED;
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}
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/*
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* aio_error is implemented in the kernel level for compatibility
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* purposes only. For a user mode async implementation, it would be
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* best to do it in a userland subroutine.
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*/
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int
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aio_error(struct proc *p, struct aio_error_args *uap, int *retval) {
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int activeflag, errorcode;
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struct aiocb iocb;
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int error;
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/*
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* Get control block
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*/
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if (error = copyin((caddr_t) uap->aiocbp, (caddr_t) &iocb, sizeof iocb))
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return error;
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if (iocb._aiocb_private.active == -1)
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return EFAULT;
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if (iocb._aiocb_private.active != AIO_PMODE_ACTIVE) {
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retval[0] = EINVAL;
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return(0);
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}
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retval[0] = iocb._aiocb_private.error;
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return(0);
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}
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int
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aio_read(struct proc *p, struct aio_read_args *uap, int *retval) {
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struct filedesc *fdp;
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struct file *fp;
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struct uio auio;
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struct iovec aiov;
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unsigned int fd;
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int cnt;
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struct aiocb iocb;
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int error;
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/*
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* Get control block
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*/
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if (error = copyin((caddr_t) uap->aiocbp, (caddr_t) &iocb, sizeof iocb))
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return error;
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/*
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* We support sync only for now.
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*/
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if ((iocb._aiocb_private.privatemodes & AIO_PMODE_SYNC) == 0)
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return ENOSYS;
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/*
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* Get the fd info for process
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*/
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fdp = p->p_fd;
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/*
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* Range check file descriptor
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*/
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fd = iocb.aio_fildes;
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if (fd >= fdp->fd_nfiles)
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return EBADF;
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fp = fdp->fd_ofiles[fd];
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if ((fp == NULL) || ((fp->f_flag & FREAD) == 0))
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return EBADF;
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if (((int) iocb.aio_offset) == -1)
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return EINVAL;
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aiov.iov_base = iocb.aio_buf;
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aiov.iov_len = iocb.aio_nbytes;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = iocb.aio_offset;
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auio.uio_resid = iocb.aio_nbytes;
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if (auio.uio_resid < 0)
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return (EINVAL);
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auio.uio_rw = UIO_READ;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = p;
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cnt = iocb.aio_nbytes;
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error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred);
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if (error &&
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(auio.uio_resid != cnt) &&
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(error == ERESTART || error == EINTR || error == EWOULDBLOCK))
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error = 0;
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cnt -= auio.uio_resid;
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*retval = cnt;
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return error;
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}
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/*
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* Return and suspend aren't supported (yet).
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*/
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int
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aio_return(struct proc *p, struct aio_return_args *uap, int *retval) {
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return (0);
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}
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int
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aio_suspend(struct proc *p, struct aio_suspend_args *uap, int *retval) {
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return (0);
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}
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int
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aio_write(struct proc *p, struct aio_write_args *uap, int *retval) {
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struct filedesc *fdp;
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struct file *fp;
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struct uio auio;
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struct iovec aiov;
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unsigned int fd;
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int cnt;
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struct aiocb iocb;
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int error;
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if (error = copyin((caddr_t) uap->aiocbp, (caddr_t) &iocb, sizeof iocb))
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return error;
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/*
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* We support sync only for now.
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*/
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if ((iocb._aiocb_private.privatemodes & AIO_PMODE_SYNC) == 0)
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return ENOSYS;
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/*
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* Get the fd info for process
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*/
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fdp = p->p_fd;
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/*
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* Range check file descriptor
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*/
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fd = iocb.aio_fildes;
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if (fd >= fdp->fd_nfiles)
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return EBADF;
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fp = fdp->fd_ofiles[fd];
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if ((fp == NULL) || ((fp->f_flag & FWRITE) == 0))
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return EBADF;
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if (((int) iocb.aio_offset) == -1)
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return EINVAL;
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aiov.iov_base = iocb.aio_buf;
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aiov.iov_len = iocb.aio_nbytes;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = iocb.aio_offset;
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auio.uio_resid = iocb.aio_nbytes;
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if (auio.uio_resid < 0)
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return (EINVAL);
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auio.uio_rw = UIO_WRITE;
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auio.uio_segflg = UIO_USERSPACE;
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auio.uio_procp = p;
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cnt = iocb.aio_nbytes;
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error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred);
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if (error) {
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if (auio.uio_resid != cnt) {
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if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
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error = 0;
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if (error == EPIPE)
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psignal(p, SIGPIPE);
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}
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}
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cnt -= auio.uio_resid;
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*retval = cnt;
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return error;
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}
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int
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lio_listio(struct proc *p, struct lio_listio_args *uap, int *retval) {
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struct filedesc *fdp;
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struct file *fp;
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struct uio auio;
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struct iovec aiov;
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unsigned int fd;
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int cnt;
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unsigned int iocblen, iocbcnt;
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struct aiocb *iocb;
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int error;
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int i;
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if (uap->mode == LIO_NOWAIT)
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return ENOSYS;
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iocbcnt = uap->nent;
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if (iocbcnt > AIO_LISTIO_MAX)
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return EINVAL;
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return ENOSYS;
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}
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